| Streets of Revetal AS | Wholesale & retail | 2015 |
| Streets of Strømmen AS | Wholesale & retail | 2015 |
| Streets of Tønsberg AS | Wholesale & retail | 2015 |
| Strich AS | Professional & scientific | 2019 |
| Strømgaten 48 AS | Real estate | 2024 |
| Strømnes Eiendom AS | Wholesale & retail | 2008 |
| Studio Frodeløkka Ans | Real estate | 2016 |
| Studio Nord Ventures AS | | 2026 |
| Studio Smuget AS | Other services | 2022 |
| Stunt Holding AS | Financial services | 2011 |
| Stylish Pro AS | Other services | 2026 |
| Styrbord Holding AS | | 2021 |
| Ståle K Holding AS | Real estate | 2005 |
| Sub Kilden AS | Hospitality | 2017 |
| Subsea Bellows AS | Professional & scientific | 2022 |
| Sumango AS | Information & communication | 2013 |
| Sunny Acai Bowls AS | Hospitality | 2026 |
| Super Corp. AS | | 2022 |
| Superfish Norway AS | Wholesale & retail | 2002 |
| Superlabs AS | Information & communication | 2018 |
| Sval Capital AS | | 2025 |
| Svali AS | Wholesale & retail | 2026 |
| Svane Tønsberg AS | Wholesale & retail | 2011 |
| Svart Kapital AS | Information & communication | 2024 |
| Sveidis Holding AS | Real estate | 2005 |
| Svein Helge Grinden Holding AS | | 2024 |
| Svelvik Eiendom AS | Real estate | 1998 |
| Svendsen Kapital AS | Real estate | 2005 |
| Sverres Gate 12 AS | Real estate | 2023 |
| Sviger AS | Financial services | 2021 |
| Sweco Asset Management Technologies AS | Professional & scientific | 1991 |
| Swift Holding AS | Professional & scientific | 2005 |
| Switchit AS | Information & communication | 2020 |
| Syd Eiendom AS | Real estate | 2021 |
| Sykkellåven Tønsberg AS | Wholesale & retail | 2008 |
| Symposia AS | | 1971 |
| Sync AS | | 2021 |
| Synconomy AS | Professional & scientific | 2025 |
| Synerg AS | Professional & scientific | 2024 |
| Synergy AS | Professional & scientific | 2004 |
| Synkope Booking AS | Professional & scientific | 2019 |
| Syse-Sender Ranch AS | Professional & scientific | 2023 |
| Sølvvaren Holding AS | Manufacturing | 1993 |
| Søndre Husvik AS | Information & communication | 2017 |
| Søndre Synken Holding AS | Information & communication | 2023 |
| Sør AS | Wholesale & retail | 2021 |
| Sørensen Hoff Dagligvare AS | Wholesale & retail | 2023 |
| Sørensen Holding AS | Real estate | 2009 |
| Sørumshagen Holding AS | | 2026 |
| T Christensen AS | Professional & scientific | 2014 |
| T-Lobok Eiendom AS | Real estate | 2017 |
| Ta Eiken Invest AS | Wholesale & retail | 2020 |
| Tace IT AS | Information & communication | 2005 |
| Tafi Holding AS | | 2023 |
| Tafjord Future AS | Professional & scientific | 2020 |
| Tah Holding AS | | 2005 |
| Tamarin AS | | 2020 |
| Tango Eiendom AS | Real estate | 2003 |
| Tangstad Stunt AS | Arts & recreation | 2018 |
| Tanha Invest AS | Financial services | 2017 |
| Tannlege Christel Urdal AS | Health & social care | 2009 |
| Tannlege E T Nørstebø AS | Health & social care | 1998 |
| Tannlege Haakon Andersen AS | Health & social care | 2015 |
| Tannlege Hopen & Co AS | Health & social care | 2009 |
| Tannlege Johan Killingstad AS | Health & social care | 2012 |
| Tannlege Jon Unger Norveel AS | Health & social care | 1997 |
| Tannlege Kristian Aandahl AS | Health & social care | 2010 |
| Tannlege LML AS | Health & social care | 2020 |
| Tannlege Magnus Dahl Eide AS | Health & social care | 2013 |
| Tannlege Thomas Arentz AS | Health & social care | 2000 |
| Tannlege Victoria Pegg AS | Health & social care | 2012 |
| Tannlegene Prøsch AS | Health & social care | 1996 |
| Tannlegevakten AS | Health & social care | 2022 |
| Tanstadveien 61 AS | Real estate | 2021 |
| Taverna Pythagoras Da | Hospitality | 2004 |
| Tba Kirurgi AS | Health & social care | 2017 |
| TBG Elektro AS | Construction | 2026 |
| Tbgbolig 1 AS | Real estate | 2025 |
| Tbgeiendom AS | Real estate | 2017 |
| Tbgutvikling AS | Real estate | 2021 |
| TBP Consulting (Nordic) AS | Professional & scientific | 2023 |
| TBP Holding AS | | 2025 |
| TC Bygg Og Eiendomsrådgivning AS | Real estate | 2021 |
| TCR Drift AS | Professional & scientific | 2015 |
| Te-Am AS | Education | 2018 |
| Team Byggmontasje AS | Construction | 2025 |
| Team Jonassen AS | Transport & logistics | 2013 |
| Team Klubben AS | Hospitality | 2017 |
| Team Leader AS | Professional & scientific | 2021 |
| Team Spirit Kampsportsenter AS | Arts & recreation | 2012 |
| Team Vi AS | Wholesale & retail | 2024 |
| Teco AS | Administrative & support | 1992 |
| Teglhageveien 29 AS | Real estate | 2019 |
| Teie Bolig AS | Real estate | 2006 |
| Teie Eiendom AS | Real estate | 2003 |
| Teie Parkering AS | Transport & logistics | 2022 |
| Teigenveien 11 AS | | 2005 |
| Teisbekk Takst Og Eiendom AS | Real estate | 2018 |
| Teisteveien AS | Administrative & support | 2024 |
| Tekhnopia AS | Information & communication | 2012 |